Reported October, 2007

BACKGROUND: Engineers are using the tether-controlled Sahara sensor inside water mains to pinpoint even the smallest leaks -- without disrupting pipeline service. Consumers can't see the technology but the nonetheless reap the benefits. The sensors ensure that water keeps flowing through pipes reliably and safely.

HOW IT WORKS: The system is inserted into a live transmission main through any tap two inches or more in diameter. It is safe for all drinking water systems. The probe is carried along the pipe by the flow of water, and the system locates leaks as small as one-quarter of a gallon per hour. It does this, in real time, through the identification of distinctive acoustic signals generated by leaks in the pipe walls, the joints, or steel welds. Once a leak has been detected, the sensor head can be stopped at the precise position of the leak. Its location within the main can be identified from the surface and accurately marked for subsequent excavation and repair. As a result, operators can also use Sahara to accurately map the course of a pipeline.

BENEFITS: Depending on the pipe configuration, lengths of up to 6,000 feet can be surveyed with a single insertion, and inspections can be conducted in mains with a diameter of at least 12 inches. The ability to identify individual leaks has many benefits, such as helping water transmission pipeline operators pinpoint the exact location of the leaks causing a pipeline to fail a pressure test. Based on this information, it is easier to establish priorities for repair and replacement of parts. More generally, being able to establish the structural integrity of a given water transmission main makes it easier to more accurately value pipeline assets, and comply with legal requirements.

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The American Waterworks Association contributed to the information contained in the TV portion of this report.

If you would like more information, please contact:

Dr. Brian Mergelas, President and CEO
Pressure Pipe Inspection Company
(905) 624-1040 x 206
mergelas@ppic.com

American Water Works Association
Denver, CO
(303) 794-7711 or (800) 926-7337
http://www.awwa.org

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